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To put a fine point on MR's comment, it isn't so much that Shapton GS stones suck as that waterstones in general suck on this steel.

Although this is a theoretical understanding, it seems that Aluminum oxide based stones abrade the surrounding matrix well enough but have a hell of a time with large vanadium carbides, so you need something harder than vanadium carbide to get through them. Enter damonds and the next hardest abrasive, CBN. Boron carbide isn't quite hard enough compared to vanadium carbide.

There is an interesting anectdotal report where a customer (Tim C) used a 180 grit Nubatama Bamboo stone for the EdgePro with success on S30v.

Given that the abrasive in this stone is of higher Moh's hardness than Aluminum oxide based stones like Shaptons and Choceras, this warrants further study along with it's coarser relatives for use on S30v.

One solution ( ) is to use diamonds / CBN on waterstones - including Shaptons and Nubatamas and even naturals to enhance performance on these abrasion resistant steels, extending the range of capabilities of waterstones to more abrasion resistant steels. Although I haven't specifically tried S30v on a Meara natural stone, for some reason the Meara seems to work very well on a variety of powdered metal steels. Quite mysterious.

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